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<title>GNU Scientific Library &ndash; Reference Manual: Initializing matrix elements</title>

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<a name="Initializing-matrix-elements"></a>
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<p>
Next: <a href="Reading-and-writing-matrices.html#Reading-and-writing-matrices" accesskey="n" rel="next">Reading and writing matrices</a>, Previous: <a href="Accessing-matrix-elements.html#Accessing-matrix-elements" accesskey="p" rel="previous">Accessing matrix elements</a>, Up: <a href="Matrices.html#Matrices" accesskey="u" rel="up">Matrices</a> &nbsp; [<a href="Function-Index.html#Function-Index" title="Index" rel="index">Index</a>]</p>
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<a name="Initializing-matrix-elements-1"></a>
<h4 class="subsection">8.4.3 Initializing matrix elements</h4>
<a name="index-matrices_002c-initializing"></a>
<a name="index-initializing-matrices"></a>
<a name="index-identity-matrix"></a>
<a name="index-matrix_002c-identity"></a>
<a name="index-zero-matrix"></a>
<a name="index-matrix_002c-zero"></a>
<a name="index-constant-matrix"></a>
<a name="index-matrix_002c-constant"></a>

<dl>
<dt><a name="index-gsl_005fmatrix_005fset_005fall"></a>Function: <em>void</em> <strong>gsl_matrix_set_all</strong> <em>(gsl_matrix * <var>m</var>, double <var>x</var>)</em></dt>
<dd><p>This function sets all the elements of the matrix <var>m</var> to the value
<var>x</var>.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fmatrix_005fset_005fzero"></a>Function: <em>void</em> <strong>gsl_matrix_set_zero</strong> <em>(gsl_matrix * <var>m</var>)</em></dt>
<dd><p>This function sets all the elements of the matrix <var>m</var> to zero.
</p></dd></dl>

<dl>
<dt><a name="index-gsl_005fmatrix_005fset_005fidentity"></a>Function: <em>void</em> <strong>gsl_matrix_set_identity</strong> <em>(gsl_matrix * <var>m</var>)</em></dt>
<dd><p>This function sets the elements of the matrix <var>m</var> to the
corresponding elements of the identity matrix, <em>m(i,j) =
\delta(i,j)</em>, i.e. a unit diagonal with all off-diagonal elements zero.
This applies to both square and rectangular matrices.
</p></dd></dl>




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